1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright IBM Corp. 2001, 2012
* Author(s): Robert Burroughs
* Eric Rossman (edrossma@us.ibm.com)
* Cornelia Huck <cornelia.huck@de.ibm.com>
*
* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
* Ralph Wuerthner <rwuerthn@de.ibm.com>
* MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/compat.h>
#include <linux/slab.h>
#include <linux/atomic.h>
#include <linux/uaccess.h>
#include <linux/hw_random.h>
#include <linux/debugfs.h>
#include <asm/debug.h>
#include "zcrypt_debug.h"
#include "zcrypt_api.h"
#include "zcrypt_msgtype6.h"
#include "zcrypt_msgtype50.h"
/*
* Device attributes common for all crypto queue devices.
*/
static ssize_t online_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct ap_queue *aq = to_ap_queue(dev);
struct zcrypt_queue *zq = aq->private;
int online = aq->config && zq->online ? 1 : 0;
return scnprintf(buf, PAGE_SIZE, "%d\n", online);
}
static ssize_t online_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct ap_queue *aq = to_ap_queue(dev);
struct zcrypt_queue *zq = aq->private;
struct zcrypt_card *zc = zq->zcard;
int online;
if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
return -EINVAL;
if (online && (!aq->config || !aq->card->config))
return -ENODEV;
if (online && !zc->online)
return -EINVAL;
zq->online = online;
ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x online=%d\n",
AP_QID_CARD(zq->queue->qid),
AP_QID_QUEUE(zq->queue->qid),
online);
ap_send_online_uevent(&aq->ap_dev, online);
if (!online)
ap_flush_queue(zq->queue);
return count;
}
static DEVICE_ATTR_RW(online);
static ssize_t load_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct zcrypt_queue *zq = to_ap_queue(dev)->private;
return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load));
}
static DEVICE_ATTR_RO(load);
static struct attribute *zcrypt_queue_attrs[] = {
&dev_attr_online.attr,
&dev_attr_load.attr,
NULL,
};
static const struct attribute_group zcrypt_queue_attr_group = {
.attrs = zcrypt_queue_attrs,
};
bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)
{
if (!!zq->online != !!online) {
zq->online = online;
if (!online)
ap_flush_queue(zq->queue);
return true;
}
return false;
}
struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size)
{
struct zcrypt_queue *zq;
zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL);
if (!zq)
return NULL;
zq->reply.msg = kmalloc(max_response_size, GFP_KERNEL);
if (!zq->reply.msg)
goto out_free;
zq->reply.len = max_response_size;
INIT_LIST_HEAD(&zq->list);
kref_init(&zq->refcount);
return zq;
out_free:
kfree(zq);
return NULL;
}
EXPORT_SYMBOL(zcrypt_queue_alloc);
void zcrypt_queue_free(struct zcrypt_queue *zq)
{
kfree(zq->reply.msg);
kfree(zq);
}
EXPORT_SYMBOL(zcrypt_queue_free);
static void zcrypt_queue_release(struct kref *kref)
{
struct zcrypt_queue *zq =
container_of(kref, struct zcrypt_queue, refcount);
zcrypt_queue_free(zq);
}
void zcrypt_queue_get(struct zcrypt_queue *zq)
{
kref_get(&zq->refcount);
}
EXPORT_SYMBOL(zcrypt_queue_get);
int zcrypt_queue_put(struct zcrypt_queue *zq)
{
return kref_put(&zq->refcount, zcrypt_queue_release);
}
EXPORT_SYMBOL(zcrypt_queue_put);
/**
* zcrypt_queue_register() - Register a crypto queue device.
* @zq: Pointer to a crypto queue device
*
* Register a crypto queue device. Returns 0 if successful.
*/
int zcrypt_queue_register(struct zcrypt_queue *zq)
{
struct zcrypt_card *zc;
int rc;
spin_lock(&zcrypt_list_lock);
zc = zq->queue->card->private;
zcrypt_card_get(zc);
zq->zcard = zc;
zq->online = 1; /* New devices are online by default. */
ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n",
AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));
list_add_tail(&zq->list, &zc->zqueues);
spin_unlock(&zcrypt_list_lock);
rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj,
&zcrypt_queue_attr_group);
if (rc)
goto out;
if (zq->ops->rng) {
rc = zcrypt_rng_device_add();
if (rc)
goto out_unregister;
}
return 0;
out_unregister:
sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
&zcrypt_queue_attr_group);
out:
spin_lock(&zcrypt_list_lock);
list_del_init(&zq->list);
spin_unlock(&zcrypt_list_lock);
zcrypt_card_put(zc);
return rc;
}
EXPORT_SYMBOL(zcrypt_queue_register);
/**
* zcrypt_queue_unregister(): Unregister a crypto queue device.
* @zq: Pointer to crypto queue device
*
* Unregister a crypto queue device.
*/
void zcrypt_queue_unregister(struct zcrypt_queue *zq)
{
struct zcrypt_card *zc;
ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n",
AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));
zc = zq->zcard;
spin_lock(&zcrypt_list_lock);
list_del_init(&zq->list);
spin_unlock(&zcrypt_list_lock);
if (zq->ops->rng)
zcrypt_rng_device_remove();
sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
&zcrypt_queue_attr_group);
zcrypt_card_put(zc);
zcrypt_queue_put(zq);
}
EXPORT_SYMBOL(zcrypt_queue_unregister);
|
